Replacement window sales jobs involve working with a client or customer to coordinate the repair and installation of windows for their home or place of business. As a sales representative, your responsibilities include meeting with a client to discuss their needs, determining the best product options for a construction project, and selling windows and installation services to the client. You can also sell windows door-to-door. You typically work for a window manufacturer or wholesale company and perform your duties as a part-time or full-time employee. You usually work for a base salary and may receive commissions on the windows and services you sell.